Table 2: Experimental design matrix with experimental and predicted values of bioethanol yield.

Run numberFactors/Levels
Incubation period h Initial pH Incubation temperature °C Molasses conc wt.% Bioethanol yield
g/L
Coded valueActual valueCoded valueActual valueCoded valueActual valueCoded valueActual valueExperimental dataPredicted data

1+172.00−15.00+140.00+125.0088.8690.14
2048.0006.00+140.00020.00243.32224.85
3048.0006.00030.00020.00178.89177.44
4+172.0006.00030.00020.00192.03183.22
5−124.00+17.00−120.00+125.00220.45207.73
6048.0006.00030.00+125.00110.22108.58
7048.0006.00−120.00020.00200.00218.18
8+172.00−15.00+140.00−115.00230.93232.68
9048.0006.00030.00020.00177.00177.44
10+172.00−15.00−120.00−115.0074.3981.02
11048.0006.00030.00−115.00112.00113.36
12048.00+17.00030.00020.0086.0084.45
13−124.00+17.00−120.00−115.0065.0074.75
14−124.00−15.00−120.00−115.0036.7314.50
15048.0006.00030.00020.00176.00177.44
16048.0006.00030.00020.00179.00177.44
17+172.00+17.00−120.00−115.0012.008.01
18+172.00−15.00−120.00+125.0010.004.04
19−124.00−15.00+140.00+125.005.001.98
20+172.00+17.00+140.00−115.0050.0049.27
21−124.00−15.00−120.00+125.0014.1825.95
22−124.00+17.00+140.00−115.007.001.99
23+172.00+17.00+140.00+125.0017.0028.27
24048.00−15.00030.00020.0084.0085.26
25−124.00+17.00+140.00+125.0065.0069.41
26−124.0006.00030.00020.00162.00170.53
27+172.00+17.00−120.00+125.0054.0052.56
28048.0006.00030.00020.00174.00177.44
29−124.00−15.00+140.00−115.0039.6652.13
30048.0006.00030.00020.00178.90177.44